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Epson DFX-8500 Service Manual

Impact serial dot matrix printer
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EPSON
IMPACT SERIAL DOT MATRIX PRINTER
DFX-8500

SERVICE MANUAL

SEIKO EPSON CORPORATION
4009310

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Summary of Contents for Epson DFX-8500

  • Page 1: Service Manual

    EPSON IMPACT SERIAL DOT MATRIX PRINTER DFX-8500 SERVICE MANUAL SEIKO EPSON CORPORATION 4009310...
  • Page 2 However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. ƒ The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or the consequences thereof. EPSON is a registered trademark of SEIKO EPSON CORPORATION.
  • Page 3 POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. CAUTION 1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY EPSON CERTIFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE.
  • Page 4 Includes a step-by-step guide for product disassembly and assembly. CHAPTER 4. ADJUSTMENT Includes a step-by-step guide for adjustment. CHAPTER 5. TROUBLESHOOTING Provides EPSON-approved techniques for troubleshooting. CHAPTER 6. MAINTENANCE Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment.
  • Page 5 REVISION SHEET Revision Issued Data Contents Rev. A May 18, 1998/ First issue Rev. B June 25, 1998 Second issue due to minor correction on the manual contents.

  • Page 6: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENT CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX...
  • Page 7 CHAPTER 1 GENERAL DESCRIPTION 1.1 FEATURES......................1-1 1.2 SPECIFICATIONS....................1-3 1.2.1 Printing Specification......................1-3 1.2.2 Paper Feeding ......................... 1-6 1.2.3 Electrical Specification ......................1-6 1.2.4 Environmental Condition....................... 1-6 1.2.5 Reliability..........................1-6 1.2.6 Safety Approvals ........................1-7 1.2.7 CE Marking ..........................1-7 1.2.8 Acoustic Noise........................1-7 1.2.9 Ribbon Cartridge ........................
  • Page 8 1.5.4 C204 DRV-B Board........................1-41 1.5.5 C204 SUB Board........................1-41 1.5.6 C204 PSB/PSE Board......................1-42 1.5.7 Control Panel.........................1-43 1.5.8 Housing..........................1-43...

  • Page 9: General Description

    ‰ Bi-directional parallel interface (IEEE-1284 nibble) and RS-232C serial interface standard ‰ EPSON ESC/P (upper compatible with DFX-8000) and IBM/LEXMARK 2381Plus emulation ‰ 35 character tables in the NLSP (National Language Support) version and 11 character tables in the standard version ‰...
  • Page 10 DFX-8500 The following table shows options. Table 1-1. Option Code Name #8766 Ribbon cartridge #8767 Ribbon pack #8309 Pull tractor unit C81500X Paper cutter C81507X Perforation cutter C82305* Serial interface card (inch screw) C82306* Serial interface card (mm screw) C82307* 32-KB intelligent serial I/F card (inch screw) C82308* 32-KB intelligent serial I/F card (mm screw)

  • Page 11: Specifications

    GENERAL DESCRIPTION 1.2 SPECIFICATIONS This section describes the specifications for DFX-8500. 1.2.1 Printing Specification ‰ Print method Impact dot matrix ‰ Number of pins 18-pin (Refer to Figure 1-2.) ‰ Print pin arrangement : 9 x 2 ‰ Print pin diameter 0.0114 inches (0.29 mm) ‰ Color...
  • Page 12 „ Bit map font: EPSON Draft 10 CPI, 12 CPI, 15 CPI EPSON Roman 10 CPI. 12 CPI, 15 CPI, Proportional EPSON Sans Serif 10 CPI, 12 CPI, 15 CPI, Proportional „ Bar code: EAN-13 EAN-8 Interleaved 2 of 5...
  • Page 13 Table 1-4. Character tables and type faces Character Table Bitmap Font Standard version Italic Table EPSON Draft PC437 (US, Standard Europe) EPSON Roman PC850 (Multilingual) EPSON Sans Serif PC860 (Portuguese) PC861 (Icelandic) PC863 (Canadian French) PC865 (Nordic) Abicomp BRASCII Roman 8 ISO Latin 1...

  • Page 14: Paper Feeding

    DFX-8500 1.2.2 Paper Feeding ‰ Feeding method: Push tractor feed (front / rear) Push and pull tractor feed (front / rear) ‰ Feeder: Front push tractor, rear push tractor, pull tractor (option) ‰ Paper insertion side alignment : Left ‰ Paper path: Tractor (front in, rear in, top out) ‰...

  • Page 15: Safety Approvals

    GENERAL DESCRIPTION 1.2.6 Safety Approvals ‰ 120 V version: „ Safety standards : UL1950 with D3 CSA C22.2 No.950 with D3 „ EMI : FCC part 15 subpart B class B CSA C108.8 class B ‰ 230 V version: „ Safety standards : EN60950 (VDE, NEMKO) „...

  • Page 16: Printable Area

    DFX-8500 1.2.11 Printable area ‰ Continuous paper : Refer to Figure 1-3. Continuous Paper PW (width) Refer to Section 1.2.12. PL (length) Refer to Section 1.2.12. LM (left margin) 13 mm to 31mm RM (right margin) 13 mm or more TM (top margin) 2.6 mm or more BM (bottom margin)
  • Page 17 GENERAL DESCRIPTION ‰ Labels : Refer to Figure 1-4. Continuous Paper PW (width) Refer to Section 1.2.12. PL (length) Refer to Section 1.2.12. LM (left margin) 13 mm to 31mm RM (right margin) 13 mm or more TM (top margin) 2.6 mm or more BM (bottom margin) 4.2 mm or more...
  • Page 18 DFX-8500 ‰ Continuous forms with labels : Refer to Figure 1-5. Continuous Paper PW (width) Refer to Section 1.2.12. PL (length) Refer to Section 1.2.12. LM (left margin) 13 mm to 31mm RM (right margin) 13 mm or more TM (top margin) 2.6 mm or more BM (bottom margin) 4.2 mm or more...
  • Page 19 GENERAL DESCRIPTION ‰ Overlapping multi-part forms : Refer to Figure 1-6. Continuous Paper PW (width) Refer to Section 1.2.12. PL (length) Refer to Section 1.2.12. LM (left margin) 19 mm to 31mm RM (right margin) 19 mm or more TM (top margin) 21.2 mm or more BM (bottom margin) 4.2 mm or more...

  • Page 20: Paper And Media

    DFX-8500 1.2.12 Paper and Media 1.2.12.1 Continuous paper (Single sheet and multi-part) Table 1-5. Continuous Paper Front Entry Rear Entry Minimum Maximum Minimum Maximum Width (inch) 16.0 16.0 (mm) Length (inch) 17.0 17.0 (mm) Copies 1 original + 6 copies 1 original + 5 copies Total Thickness (inch)
  • Page 21 GENERAL DESCRIPTION Figure 1-8. Paper-stapling Height Figure 1-9. Paper-stapling Method 1 Figure 1-10. Paper -stapling Method 2 Rev. B...

  • Page 22: Labels

    DFX-8500 1.2.12.2 Labels Table 1-6. Labels Front Entry Rear Entry Minimum Maximum Minimum Maximum Label Size Refer to Figure 1-11. Backing Sheet Width (inch) 16.0 (mm) Backing Sheet Length (inch) 17.0 (mm) Label Thickness (inch) 0.0047 (mm) 0.12 Total Thickness (inch) 0.0025 0.0075...

  • Page 23: Continuous Forms With Labels

    GENERAL DESCRIPTION 1.2.12.3 Continuous Forms with Labels Table 1-7. Continuous Forms with Labels Front Entry Rear Entry Minimum Maximum Minimum Maximum Label Size Refer to Section 1.2.12.2. Width (inch) 16.0 (mm) Length (inch) 17.0 (mm) Weight (g/m 52.6 82.7 (not multi-part) (lb) Weight (g/m...

  • Page 24: Overlapping Multi-Part Form

    DFX-8500 1.2.12.4 Overlapping Multi-part Form Table 1-8. Overlapping Multi-part Form Front Entry Rear Entry Minimum Maximum Minimum Maximum Width (inch) 16.0 (mm) Length (inch) 17.0 (mm) Weight (g/m 52.6 82.7 (not multi-part) (lb) Weight (g/m 41.4 56.4 (one sheet of multi-part) (lb) Copies 1 original + 5 copies + 1 backing...
  • Page 25 GENERAL DESCRIPTION Figure 1-12. Paper Width Overlapping Area Figure 1-13. Perforations 1 Figure 1-14. Perforations 2 Rev. B...
  • Page 26 DFX-8500 Figure 1-16. Raised Portion at a Perforation Figure 1-15. Perforations 3 Figure 1-18. Sprocket Hole 1 Figure 1-19. Sprocket Hole 2 Figure 1-17. Unsuitable Paper Figure 1-20. Bad Folded Paper 1-18 Rev. B...

  • Page 27: Interfaces

    GENERAL DESCRIPTION 1.3 INTERFACES The DFX-8500 is equipped with parallel interface, serial interface, and optional Type-B interface card. This section presents the specifications for each interface type. 1.3.1 Parallel Interface (Forward channel) ‰ Data transmission mode: 8-bit parallel, IEEE-1284 compatibility mode ‰ Synchronization: /STROBE pulse...
  • Page 28 DFX-8500 ‰ Signal Level: TTL-level compatible, IEEE-1284 level 1 device Refer to Table 1-9. Table 1-9. Signal Level Parameter Minimum Maximum Condition VOH* 5.5 V VOL* -0.5 V IOH* 0.32 mA VOH = 2.4 V IOL* 12 mA VOL = 0.4 V 50 pF 2.0 V 0.8 V...

  • Page 29: Parallel Interface (Reverse Channel)

    00h or 04h, which mean: 00h : Request nibble mode of reverse channel transfer 04h : Request device ID in nibble mode of reverse channel transfer ‰ Device ID : [00h][3Ah] MPG:EPSON; CMD:ESCP9,PRPII9,BDC; MDL:DFX-8500; CLS:PRINTER; ‰Connector pin assignments: Refer to Table 1-11.

  • Page 30: Serial Interface

    DFX-8500 1.3.3 Serial Interface ‰ Synchronization : Asynchronous ‰ Signal level (ELA-232D) : „ MARK (logical 1) : -3Vto-25V „ SPACE (logical 0) : +3Vto+25V ‰ Word length : „ Start bit : 1 bit „ Data bit : 8 bit „ Parity bit : Odd, Even, Non, of Ignore...

  • Page 31: Interface Selection

    GENERAL DESCRIPTION 1.3.5 Interface Selection The printer has three interfaces; the parallel interface, serial interface, and optional Type-B interface. These interfaces are selected manually by DIP SW or selected automatically. ‰ Manual selection: One of three interfaces can be selected by DIP SW setting. ‰ Automatic selection: The automatic interface selection is enabled by DIP SW setting.

  • Page 32: Operating Instructions

    DFX-8500 1.4 OPERATING INSTRUCTIONS This section describes the functions performed through the control panel, such as test print, hexadecimal dump, and paper memory function. 1.4.1 Control Panel The printer control panel gives you easy control over most common printer operations. The panel consists of indicator lights and buttons.

  • Page 33: Switches

    GENERAL DESCRIPTION 1.4.1.1 Switches The control panel contains eleven switches. ‰Operation in normal mode: In normal mode, pressing panel switches executes following function. Refer to Table 1-13. Table 1-13. Switch Function in Normal Mode Switch Function Front / Rear Change the front and rear paper path alternately. „ Alternates printing and no-printing status.

  • Page 34: Indicators

    DFX-8500 1.4.1.2 Indicators The control panel contains fifteen LEDs. ‰Rear (2) (Green / Red) : „Green LED on when the rear paper path is selected with paper. „Red LED on when the rear paper path is selected without paper. „Off when the front paper path is selected. ‰Front (2) (Green / Red) : „Green LED on when the front paper path is selected with paper.

  • Page 35: Errors And Buzzers

    GENERAL DESCRIPTION 1.4.2 Errors and Buzzers Errors fall into 2 types; normal error/warning and fatal error. See the tables below for detailed information. Table 1-15. Error/Warning Buzzer Information Error/Warning PAUSE Paper Out Ribbon Beeper *1) Description On Line Pause Head hot Blinking Head Fan hot Blinking...

  • Page 36: Dip Switch Settings

    DFX-8500 1.4.3 DIP Switch Settings There are five DIP switches that are located at the front paper entrance of the printer. These DIP switches can set the printer defaults. When power is applied or the printer is reset, the DIP switch selections are treated as the default setup. If the setup is changed, the power should be cycled or the printer should be reset.
  • Page 37 GENERAL DESCRIPTION Table 1-17. Character Table Setting (Standard) SW 1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 Character table PC437 (US, standard Europe) PC850 (Multilingual) PC860 (Portuguese) PC861 (Icelandic) PC863 (Canadian-French) PC865 (Nordic) Abicomp BRASCII Roman 8 ISO Latin 1 Italic USA Italic France Italic German Italic U.K...
  • Page 38 DFX-8500 Table 1-19. Front Tractor Page Length SW2-1 SW2-2 SW2-3 SW2-4 Page length for front tractor 11 inches 3 inches 3.5 inches 4 inches 5.5 inches 6 inches 7 inches 8 inches 8.5 inches 70 / 6 inches 12 inches 14 inches 17 inches Others...

  • Page 39: Functions

    GENERAL DESCRIPTION 1.4.4 Functions 1.4.4.1 Usual operation ‰Front / Rear: Changes the front and rear paper path alternately. „ Normal paper is set and the pull tractor is not used: The printer feeds the paper to the tear off position and cut the paper by the cutter, and feeds backward to paper park position.
  • Page 40 DFX-8500 ‰Paper Select: Pressing it selects one of the following paper Numbers. 1,2,3,4,5,6,7,8 : When the printer has the paper information. Always a, b : When the printer has the paper memory data. „ Normal paper is set and the pull tractor is not used: The printer feeds the paper to the tear off position and cut the paper by the cutter, and feeds it backward to the paper park position.

  • Page 41: Operation At Power On

    GENERAL DESCRIPTION 1.4.4.2 Operation at Power On ‰Self test: Prints the self test pattern. To cancel it, make printer pause and turn off the power. ‰DIP switch setting print: Starts the setting printing mode. ‰Data dump: Starts the data dump mode, in which all the input data are printed as hexadecimal numbers and corresponding characters.

  • Page 42: Built-In Detection

    DFX-8500 1.4.4.3 Built-in Detection ‰Cover open detection: When the cover is opened, the printer stops printing and enters the pause mode automatically after several beeps. The printer stays at the state until the cover is closed and the “Pause” switch is pressed. Several printer settings loaded at each power-on can be changed in this operation.

  • Page 43: Paper Memory Function

    GENERAL DESCRIPTION 1.4.5 Paper Memory Function You can get better printing quality when you print on overlapping multi-part forms or on continuous forms with labels by using the paper memory function. When you use this function, you have to write the information of paper thickness to the printer using DIP switches and the control panel in advance.

  • Page 44: Initializations

    DFX-8500 1.4.6 Initializations 1.4.6.1 Power-on Initialization The initialization of this level is activated by power-on or /INIT signal (negative pulse) or cold-reset command (remote RS command). This initialization is: to initialize the printer mechanism. to clear the all buffers of data. to cancel the download character definition.

  • Page 45: Main Component

    GENERAL DESCRIPTION 1.5 MAIN COMPONENT The main components of the DFX-8500 are as follows: ‰ Printer mechanism: M-3I60 ‰ Main control board: C204 MAIN board ‰ Mechanism driver board: C204 DRV board ‰ ½ Printhead driver board: C204 DRV-B board ‰ DIP SW.

  • Page 46: M-3I60 Printer Mechanism

    DFX-8500 1.5.1 M-3I60 Printer Mechanism The M-3I60 printer mechanism is a 18-pin (9-pin two lows), serial impact dot matrix printer mechanism developed for the DFX-8500. It is designed to provide high-speed, high-volume printing, and is especially heavy and durable when compared with existing terminal printer mechanisms, Its paper feeding mechanism uses several kinds of fan-fold paper, and an automatic mechanism is included to provide enhanced paper handling.

  • Page 47: Main Control Board (C204 Main Board)

    GENERAL DESCRIPTION 1.5.2 Main Control Board (C204 MAIN Board) The C204 MAIN board is a main controller board. The board contains following ICs: ‰ 16-bit CPU: TMP95C051A; 24.57 MHz (IC2) ‰ Gate array: E05B36 (IC1) ‰ PROM (including C.G.) : 2M-bit (IC5) ‰ 4M-bit (IC14)

  • Page 48: C204 Drv Board

    DFX-8500 1.5.3 C204 DRV Board The C204 DRV board is the driver board specially for the printer mechanism. The ½ printhead, printhead fan, plunger, PF (paper feed) motor, CR (carriage) motor, CR fan, PG (platen gap) motor, and RF (ribbon feed) motor drive circuits are located on the driver boards.

  • Page 49: C204 Drv-B Board

    GENERAL DESCRIPTION 1.5.4 C204 DRV-B Board The C204 DRV-B board is the ½ printhead driver board. The drive part is mainly consists of the discrete bipolar FETs. Figure 1-28. C204 DRV-B Board 1.5.5 C204 SUB Board The C204 SUB board consists of five DIP switch units. It is located behind the front paper cover. Figure 1-29.

  • Page 50: C204 Psb/Pse Board

    DFX-8500 1.5.6 C204 PSB/PSE Board C204 PSB/PSE board is a power supply circuit board which generates the power for the control circuit (main control board) and printer mechanism drive circuit (driver board). It contains cooling fan on the top. The PSB board is a 100-120 V AC version, and the PSE board is for 220-240 VAC. Figure 1-30.

  • Page 51: Control Panel

    GENERAL DESCRIPTION 1.5.7 Control Panel The control panel for this printer consists of switches, LEDs, and buzzers (Refer to Figure 1-22 on page 1-23.). 1.5.8 Housing The housing used in the DFX-8500 consists of many more components than previous designs. The lower case is used as the main frame which holds the mechanism and circuits, and they are covered by the upper case, bottom plate and side cover, each of which has various covers.
  • Page 53 CHAPTER 2 OPERATING PRINCIPLES 2.1 PRINTER MECHANISM OPERATION ..............2-1 2.1.1 Printhead Mechanism ......................2-4 2.1.2 Carriage Mechanism ......................2-5 2.1.3 Platen Gap Adjustment Mechanism ..................2-6 2.1.4 Paper Feed Mechanism......................2-7 2.1.4.1 Tractor Wire Operation..................... 2-9 2.1.5 Ribbon Feed and Tractor Select Mechanisms..............2-10 2.1.6 Plunger Mechanism......................

  • Page 55: Operating Principles

    OPERATING PRINCIPLES 2.1 PRINTER MECHANISM OPERATION This section describes the Model 3I60 printer mechanism and explains how the printer works. The Model 3I60 printer mechanism features a 18-pin, impact dot printhead for serial printing. The printer mechanism is the main component of the printer and is supported by the other components (the power supply and control circuits).
  • Page 56 DFX-8500 ‰Carriage mechanism : The carriage mechanism moves the printhead in the horizontal direction. The CR motor drives the carriage, with the printhead on it. The CR encoder sensor detects the CR motor speed and carriage position. The CR motor is closed-loop controlled. Because the CR motor is driven at a very high speed, it includes an isolation resistance sensor to detect abnormal resistance.
  • Page 57 OPERATING PRINCIPLES ‰Paper feed mechanism : The CR motor controls printing in the horizontal direction, and the paper feed mechanism controls movement in the vertical direction (line feeding and form feeding). The paper feed mechanism feeds paper vertically. The PF motor drives the paper feed mechanism. The front, rear, and top PE sensors detect whether paper is present in the paper path, and stop the printer from printing when there is no paper.

  • Page 58: Printhead Mechanism

    DFX-8500 2.1.1 Printhead Mechanism The printhead is a charge-type, impact dot printhead. Figure 2-4 shows its operation. The dot wire is attached to the actuating spring at point A. It is pulled back (left in the figure) by magnetic force when power is applied and during standby.

  • Page 59: Carriage Mechanism

    OPERATING PRINCIPLES 2.1.2 Carriage Mechanism Figure 2-5 shows the carriage mechanism. The front and rear carriage guide shafts support the carriage. The rotation of the CR motor is transmitted to the carriage timing belt through the carriage belt pulleys at the right and left sides.

  • Page 60: Platen Gap Adjustment Mechanism

    DFX-8500 2.1.3 Platen Gap Adjustment Mechanism Figure 2-6 shows the platen gap adjustment mechanism. The front and rear carriage guide shafts supporting the carriage have a vertical section. The rotation of the PG motor is transmitted to the rear carriage guide shaft through the gears.

  • Page 61: Paper Feed Mechanism

    OPERATING PRINCIPLES 2.1.4 Paper Feed Mechanism Figures 2-7, 2-8, and 2-9 show the paper feed mechanism. After the printer loads the paper, it is fed by the tension roller, platen roller, and front or rear tractor assembly. The PF motor rotates the tension roller and tractor select gear (Figures 2-8 and 2-9) and moves either the front or rear tractor assembly.
  • Page 62 DFX-8500 Figure 2-8. Front Tractor Assembly Operation Figure 2-9. Rear Tractor Assembly Operation Rev. B...

  • Page 63: Tractor Wire Operation

    OPERATING PRINCIPLES 2.1.4.1 Tractor Wire Operation The printer is equipped with a tractor wire (white line) to prevent paper jams when continuous paper is loaded from the front or rear entrance. The tractor tension spring on the right side frame pulls the wire and releases the stress on the continuous paper being fed.

  • Page 64: Ribbon Feed And Tractor Select Mechanisms

    DFX-8500 2.1.5 Ribbon Feed and Tractor Select Mechanisms The RF motor supplies power to both the ribbon feed and tractor select mechanisms. The rotation of the RF motor pinion swings the ribbon feed select gear like a pendulum, using the lever axis as a support point.
  • Page 65 OPERATING PRINCIPLES ‰Tractor select mechanism : Figure 2-12 shows the operation of the tractor select mechanism. Clockwise rotation of the RF motor is transmitted to the tractor select cam through the ribbon feed select gear and tractor select transmission gear, and rotates the tractor select cam clockwise. The tractor select lever contacts the inside curve of the cam due to the spring force;...

  • Page 66: Plunger Mechanism

    DFX-8500 2.1.6 Plunger Mechanism Figure 2-13 shows the plunger mechanism. The paper bail assembly is attached to the end of the plunger's iron core. The paper bail assembly axis is connected to the frame. When the plunger coil is energized, the force of the paper bail spring returns the paper bail assembly to its original position.

  • Page 67: Power Supply Operation

    OPERATING PRINCIPLES 2.2 POWER SUPPLY OPERATION The printer can be powered by either of two power supply boards: the 120 V C204 PSB board or the 220/240 V C204 PSE board. The only difference in the operation of these two boards is in the primary circuitry. They supply power to the printer in the same way.

  • Page 68: Power Supply Overview

    DFX-8500 2.2.1 Power Supply Overview Figure 2-14 shows a block diagram of the C204 PSB/PSE board. Figure 2-14. Power Supply Board Block Diagram 2-14 Rev. B...
  • Page 69 OPERATING PRINCIPLES ‰General : The power supply board converts the AC input voltage to the DC voltages required to operate the printer. The AC voltage is input to the AC inlet, and is supplied to the C204 PSB/PSE board via the power switch and a fuse.
  • Page 70 DFX-8500 ‰Protection circuits : These +37VDC line blocks perform voltage control, and they have over-current limiting and over voltage protection circuits for each. ‰Control and status signals : The PSB//PSE board receives two control signal from the C204 MAIN board and outputs two status signals to the MAIN board.

  • Page 71: Control Circuit

    OPERATING PRINCIPLES 2.3 CONTROL CIRCUIT Figure 2-15 shows a block diagram of the control circuit with the C204 MAIN board at the center. 2.3.1 Control Circuit Operation Overview The core of the control circuit is the TMP95C061AF CPU (IC2). This CPU is driven using a 24.57 MHz external clock (CRU1).
  • Page 72 DFX-8500 Figure 2-15. Control Circuit Block Diagram 2-18 Rev. B...
  • Page 73 OPERATING PRINCIPLES Table 2-5 describes the functions of the main components on the C204 MAIN and C204 DRV board. Table 2-5. Main IC Functions Board IC Name Location Functions C204 MAIN TMP95C061 Receives data from the host computer via the gate array, loads (CPU) the data to the input buffer in the RAM, and converts the image data to print data.
  • Page 74 DFX-8500 Figure 2-16 shows the data flow for data input via the parallel interface. Although various circuits perform data processing, the control core is the CPU and all operations are executed via the CPU. In this circuit, the E05B36 IC (IC1) provides the interface between the external host computer and the CPU, and all data processing is performed by read/write operations to MMIO (Memory Mapped Input / Output).

  • Page 75: Reset Circuit

    OPERATING PRINCIPLES 2.3.2 Reset Circuit This section describes the hardware reset circuit. When the hardware reset signal is input, all ICs in the control circuit are reset, and the CPU executes the program from the starting address. Figure 2-17 shows the reset circuit block diagram.

  • Page 76: Sensor Circuits

    DFX-8500 2.3.3 Sensor Circuits Figure 2-18 shows the sensor circuits in block diagram form. The printer is equipped with the following sensors: 1. Front and rear PE sensors (use a photo interrupter) 2. Top PE sensor (to detect the TOF position, uses a photo interrupter) 3.
  • Page 77 OPERATING PRINCIPLES Each sensor is described below. 1. Front and rear paper end sensors ‰Detection form: Photo interrupter ‰Output form: Open collector (pulled up to 10 K ohms resistor) ‰Logical: Paper present: LOW Paper out: HIGH 2. Top paper end sensor (to detect the TOF position) ‰Detection form: Photo reflector ‰Output form:...
  • Page 78 DFX-8500 13. Paper width sensor ‰Detection form: Photo reflector ‰Output form : Emitter follower ‰Judgemwnt : No paper present: Standard voltage level. Paper present: The voltage level is double the standard voltage level. 14. CR motor isolation resistance sensor (monitored by port AN2 of the CPU) To provide information about the CR motor life, the analog port (AN2) of the CPU checks the isolation resistance every time the printer is turned on.

  • Page 79: Cr Motor Drive Circuit

    OPERATING PRINCIPLES 2.3.4 CR Motor Drive Circuit Figure 2-19 shows the internal circuit for the CR motor,Table 2-6 provides the CR motor specification, and Figure 2-20 shows a block diagram for the CR motor drive circuit. An STK681-050 (IC1) bipolar driver IC drives the CR motor. It has built-in bipolar switching transistors and a current limiter.
  • Page 80 DFX-8500 Table 2-7 lists the CR motor drive modes. Table 2-7. CR Motor Drive Modes Division Drive Mode CR Motor Speed Acceleration / Constant (rpm) Deceleration Control Speed Curve Control Note1) Carriage moves Super Draft 2800 Acceleration and PI control with printing.
  • Page 81 OPERATING PRINCIPLES ‰PI Control : PI control keeps the CR motor speed constant using the encoder pulses ENCA and ENCB with the gate array E05B36. The E05B36 generates the PWM (pulse width modulation) signal according to the CR motor speed to the PWM port of the gate array and determines the duty of the carriage drive timing.CR ports I0, I1, and I2 output the drive signal for the CR motor.
  • Page 82 DFX-8500 ‰Deceleration control: Deceleration control provides smooth deceleration and prevents rapid vibration. The duty data for deceleration control is determined for each printing mode. Pulse width modulation (PWM) determines each printing mode. Current speed - SP3 1. The printer uses Deceleration driving mode 2, based on the duty data, and the rest of the time, it uses Deceleration driving mode 1.

  • Page 83: Pf Motor Drive Circuit

    OPERATING PRINCIPLES 2.3.5 PF Motor Drive Circuit Stepping motor driver STK6713BMK4 (IC2) drives the PF motor. Figure 2-22 shows the PF motor drive circuit block diagram, and Table 2-9 provides the PF motor specifications. Table 2-9. PF Motor Specifications Specification Description Form 4-phase, 200-pole, HB* pulse motor...

  • Page 84: Rf Motor Drive Circuit

    DFX-8500 2.3.6 RF Motor Drive Circuit Figure 2-24 shows a block diagram of the RF motor drive circuit, and Table 2-10 provides the RF motor specifications. The RF motor is a stepping motor. The control circuit performs open-loop phase switching control according to the timing data for acceleration, constant speed, and deceleration.

  • Page 85: Pg Motor Drive Circuit

    OPERATING PRINCIPLES 2.3.7 PG Motor Drive Circuit Figure 2-25 shows a block diagram of the PG motor drive circuit, and Table 2-11 provides PG motor specifications. The PG motor is a stepping motor. The motor phase switching signals are output from the E05B36 ports PGA to PGD.

  • Page 86: Plunger Drive Circuit

    DFX-8500 2.3.8 Plunger Drive Circuit Figure 2-26 shows a block diagram of the plunger drive circuit, Table 2-12 provides the plunger specification, and Table 2-13 provides the plunger switching pattern. The plunger is driven using three switching patterns. Gate array E05B26 ports PLP and PLN output the plunger coil drive signals.

  • Page 87: Printhead Drive Circuit

    OPERATING PRINCIPLES 2.3.9 Printhead Drive Circuit Figure 2-27 shows a printhead drive circuit block diagram. ‰General : The print data lines from IC1 are active when they are HIGH. When ports HDR1 (HDL1) to HDR9 (HDL9) of IC1 go HIGH, the FET gates are biased, and the FETs are turned on to apply the current to the printhead coil.
  • Page 88 DFX-8500 ‰Printhead high temperature feedback operation : The printer supports the printhead temperature detection sequence, which consists of the following steps: 1. When the printhead temperature is less than 110 C, the printer performs normal printing. 2. When the printhead temperature exceeds equal or more than 110 C, the printer performs interval printing (Carriage rest time at the sides is little bit longer than the normal.) 3.
  • Page 89 CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3.1 OVERVIEW ......................3-1 3.1.1 Precautions for Disassembly and Assembly ............... 3-1 3.1.2 Tools ............................3-3 3.1.3 Specification for Screws......................3-5 3.1.4 Service Checks After Repair....................3-6 3.2 DISASSEMBLY AND ASSEMBLY .................3-7 3.2.1 ROM Replacement........................3-8 3.2.2 Printhead and Ribbon Mask Assembly Removal ..............

  • Page 91: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 3.1 OVERVIEW This chapter describes the disassembly/assembly procedures to be used for replacing the main assemblies of the DFX-8500. 3.1.1 Precautions for Disassembly and Assembly Read this section before you disassemble, assemble, or transport the printer. WARNING Because the DFX-8500 weighs 29.0 kg (63.8 lb) and is much larger and heavier than most printers, you must be careful when handling it.
  • Page 92 DFX-8500 Before transporting the printer, remove the paper and ribbon cartridge. Then attach the following packing materials, as shown in Figure 3-1: ‰Transport locking bracket ‰Carriage guide shaft support bar ‰Printhead protector ‰Foam packing for paper bail Figure 3-1. Packing Material Attaching After attaching the packing materials, pack the printer in its container as shown in Figure 3-2.

  • Page 93: Tools

    Dial gauge base #F611 B101946700 Figure 3-4 Dial gauge master #F612 B101946800 Figure 3-5 Thickness gauge (t=0.43mm) Figure 3-6 Thickness gauge (t=0.80mm) Motor screwdriver (Phillips head, torque adjustable) o: Commercially available E: EPSON exclusive A: Mandatory B: Recommended Rev. B...
  • Page 94 DFX-8500 Figure 3-3. Dial Gauges Figure 3-4. Dial Gauge Base Figure 3-5. Thickness Gauge Figure 3-6. Dial Gauge Master Rev. B...

  • Page 95: Specification For Screws

    DISASSEMBLY AND ASSEMBLY 3.1.3 Specification for Screws In the following sections, abbreviations are used for small parts such as screws and washers. Table 3-2 lists these abbreviations. Table 3-3 lists screw and washer types. Table 3-2. Screw Abbreviations Abbreviation Part Name Cross-Bind head,, B-tight screw CBS (O) Cross-Bind head,, S-tight screw with Outside-toothed lock washer...

  • Page 96: Service Checks After Repair

    DFX-8500 3.1.4 Service Checks After Repair Before returning the printer after service, use the check list in Table 3-4, which provides a record to make servicing and shipping more efficient. Table 3-4. Inspection Check List for the Repaired Printer Category Item to check Is Check required? Maintenance Are all necessary adjustments completed? Are...

  • Page 97: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 3.2 DISASSEMBLY AND ASSEMBLY WARNING Before you disassemble or assemble the printer, be sure to read and follow the instructions in Section 3.1, "OVERVIEW." Before you disassemble the printer, be sure to turn the printer power off and disconnect AC cable. This section describes how to disassemble the printer.

  • Page 98: Rom Replacement

    DFX-8500 3.2.1 ROM Replacement CAUTION It is best to remove the top cover before you tilt back the printer as described in the steps below. Refer to Section 3.2.3.1 for instructions on removing the top cover. If you tilt back the printer with the top cover attached, be careful not to put too much weight on the top cover or any other printer components.

  • Page 99: Printhead And Ribbon Mask Assembly Removal

    DISASSEMBLY AND ASSEMBLY 3.2.2 Printhead and Ribbon Mask Assembly Removal The printhead can be changed without disassembling the entire unit. Use the exclusive printhead kit for printhead exchange on the DFX-8500. When you receive the kit, check that all of the following are included. Figure 3-8.
  • Page 100 DFX-8500 CAUTION When you remove the connector cover, be careful not to break the tabs. When you remove the printhead cable holder, be careful not to break the printhead holder latch. Use a slotted screwdriver if necessary. Step 1: Open the top cover and remove the ribbon cartridge. Step 2: Remove the two CBS (M3x8) screws securing the FPC cover to the bottom plate of the printer mechanism.
  • Page 101 DISASSEMBLY AND ASSEMBLY Step 5: Disconnect the narrow FPC cable from white connector (lock-type). Step 6: Move the carriage to around 90 column, remove the two CP(S-P1)(M4X7) screws securing the printhead and remove the CP(S-P1)(M3X6) screw securing the ground FPC, then remove the printhead.
  • Page 102 DFX-8500 ASSEMBLING POINT Confirm that the cables are connected correctly. (Refer to Figures 3-12 and 5-3..) Tighten the screws while pulling the printhead as shown below to secure the printhead firmly. Figure 3-14. Printhead Installation Step 12: Install the cable cover and the FPC cover. Step 13: Wipe off any stains from the carriage guide shaft, lubricate both ends of the carriage guide shaft with the included oil (0-2), and spread the oil over the shaft by moving the carriage manually.

  • Page 103: Housing Removal

    DISASSEMBLY AND ASSEMBLY 3.2.3 Housing Removal This section describes how to remove the housing. 3.2.3.1 Top Cover Removal CAUTION Two people are required to remove the top cover; one person must hold the top cover while the other person removes the screws. If the top cover is not supported while the screws are removed, the weight of the top cover may damage the rear hinges.

  • Page 104: Left, Right, And Front Covers Removal And Fuse Replacement

    DFX-8500 3.2.3.2 Left, Right, and Front Covers Removal and Fuse Replacement Step 1: Remove the four CBB (M4x16) screws securing the left side cover and remove the cover. Step 2: Remove the right side cover in the same way as you removed the left side cover. Also remove the four cables from the main switch on the right side cover.
  • Page 105 DISASSEMBLY AND ASSEMBLY Step 3: After you remove the right side cover, you can replace the input fuse for the C204 power supply board unit. WARNING Make sure the new fuse meets the printer's AC power specifications. Figure 3-19. Fuse Removal Step 4: Remove the three CBB (M4x16) screws securing the left side of the front cover to the lower cover.

  • Page 106: Front Panel Unit Removal

    DFX-8500 3.2.3.3 Front Panel Unit Removal Step 1: Remove the left and right side covers. (Refer to Section 3.2.3.2) Step 2: Open the top cover and disconnect connector CN5 (the panel unit connector). Step 3: Remove the two CBB (M4x16) screws from the front panel unit and remove the panel unit along with the panel connector cable.

  • Page 107: Upper Case Removal

    DISASSEMBLY AND ASSEMBLY 3.2.3.4 Upper Case Removal Step 1: Remove the front panel unit. (Refer to Section 3.2.3.3) Step 2: Remove the six CBB (M4x16) screws, and two CBB (M3x10) screws from the upper case. Then remove the upper case. Figure 3-22.

  • Page 108: Circuit Boards Removal

    DFX-8500 3.2.4 Circuit Boards Removal This section describes how to remove the circuit boards. 3.2.4.1 Bottom Panel Assembly Removal CAUTION It is best to remove the top cover before you tilt back the printer as described in the steps below. Refer to Section 3.2.3.1 for instructions on removing the top cover.
  • Page 109 DISASSEMBLY AND ASSEMBLY Step 3: From the left side, remove the two CPB(O)(M4X8) screws securing the green and yellow earth cables between the bottom plate of the printer mechanism and the earth on the bottom panel assembly. Step 4: Disconnect the 6 connectors, (1) through (6) as shown in Figure 3-24. Figure 3-24.
  • Page 110 DFX-8500 Step 7: While supporting the top cover to protect it from scratches, tilt back the printer and lay it on its back. Step 8: Remove the eight CBB (M4x16) screws securing the bottom panel assembly, and slowly remove the bottom panel unit assembly.

  • Page 111: Cooling Fan And C204 Power Supply Board Unit Removal

    DISASSEMBLY AND ASSEMBLY 3.2.4.2 Cooling Fan and C204 Power Supply Board Unit Removal Step 1: Remove the bottom panel assembly. (Refer to Section 3.2.4.1) Step 2: If you need to remove the cooling fan, disconnect connector CN5 and remove the four CCN (M3x30) screws securing it, and remove the fan.

  • Page 112: C204 Sub Board Unit Removal

    DFX-8500 3.2.4.3 C204 SUB Board Unit Removal Step 1: Remove the bottom panel assembly. (Refer to Section 3.2.4.1) Step 2: Disconnect connectors CN15 and CN16 on the C204 MAIN board. Step 3: Remove the CBB (M3x8) screw and the CBB (M3x12) screw securing the C204 SUB board assembly and remove the board.

  • Page 113: C204 Drv-B And C204 Drv Board Units Removal

    DISASSEMBLY AND ASSEMBLY 3.2.4.4 C204 DRV-B and C204 DRV Board Units Removal Step 1: Remove the bottom panel assembly. (Refer to Section 3.2.4.1) Step 2: Disconnect connector CN3 and cable connector CN14 for the C204 DRV board. Step 3: Disconnect connectors CN1 and CN2 on the C204 DRV-B board. Figure 3-29.

  • Page 114: C204 Main Board Unit Removal

    DFX-8500 3.2.4.5 C204 MAIN Board Unit Removal Step 1: Remove the bottom panel assembly. (Refer to Section 3.2.4.1) Step 2: Remove the C204 SUB board unit (Refer to Section 3.2.4.3.) Step 3: Remove the C204 DRV-B board and C204 DRV board units (Refer to Section 3.2.4.4.) Step 4: Disconnect connectors CN6, CN7, CN8, and CN10.
  • Page 115 DISASSEMBLY AND ASSEMBLY Step 5: Remove the four CBB (M3x12) screws and two CBS (O) (M3x8) screws securing the C204 MAIN board unit and remove the board. Figure 3-34. C204 MAIN Board Removal 4/4 ADJUSTMENT REQUIRED When you install the C204 MAIN board assembly, perform the following adjustments: Platen gap motor value (platen gap) adjustment (described in Section 4.1.7).

  • Page 116: Ac Inlet Removal

    DFX-8500 3.2.4.6 AC Inlet Removal Step 1: Remove the C204 power supply board assembly. (Refer to Section 3.2.4.2) Step 2: Remove the C204 MAIN board assembly. (Refer to Section 3.2.4.5) Step 3: Remove the three CBB (M3x8) screws and one CB (O) (M4x6) screw securing the grounding plate to the bottom panel assembly and remove the grounding plate.

  • Page 117: C204 Pnl Board Removal

    DISASSEMBLY AND ASSEMBLY 3.2.4.7 C204 PNL Board Removal Step 1: Remove the front panel unit. (Refer to Section 3.2.3.3) Step 2: Disconnect connectors CN1 and CN2 on the C204 PNL board. Step 3: Remove the CBB (M4x10) screw securing the C204 PNL board to the front panel unit and remove the board.

  • Page 118: Interlock Switch And Cover Open Sensor Assembly Removal

    DFX-8500 3.2.5 Interlock Switch and Cover Open Sensor Assembly Removal Step 1: Remove the upper case. (Refer to Section 3.2.3.4) Step 2: Disconnect the interlock switch cable and the cover open sensor cable from the junction board respectively. Figure 3-38. Interlock Switch Assembly Removal Step 3: Remove the CBB (M4x10) screw securing the interlock switch assembly to the lower case.

  • Page 119: Printer Mechanism Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6 Printer Mechanism Removal This section describes how to remove and disassemble the printer mechanism. Before following the steps in this section, remove the printer mechanism from the printer as described in Section 3.2.6. WARNING Because the printer mechanism is large and heavy, you must be careful when you remove it. When you lift or lower the printer mechanism, follow these precautions: Two people are required to remove or install the printer mechanism.
  • Page 120 DFX-8500 Step 5: Remove the four screws securing the printer mechanism to the lower case. Figure 3-43. Printer Mechanism Removal 1/2 Step 6: Install the lift handles from the inside of the printer mechanism. Insert each handle through the two holes in the side frames of the printer mechanism. Then slowly lift up the printer mechanism using the handles and remove it from the lower case.

  • Page 121: Fan Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.1 Fan Removal Step 1: Remove the upper case unit. (Refer to Section 3.2.3.4.) Step 2: Remove the right cover. (Refer to Section 3.2.3.2.) Step 3: Disconnect the connector for the fan from the relay connector. Step 4: Remove the CP(O) screw securing the fan duct to the left frame and the CC screw securing the fan and the fan duct to the shaft on the left frame.

  • Page 122: Ribbon Feed Change Lever Unit Removal

    DFX-8500 3.2.6.2 Ribbon Feed Change Lever Unit Removal Step 1: Release the three hooks securing the ribbon feed gear cover to the ribbon feed motor frame and remove the cover and the ribbon feed gear. Step 2: Disconnect the three connectors for the ribbon feed motor, tractor select sensor, and the ribbon jam sensor from the connector junction board, as shown in Figure 3-47 and Figure 3-48.
  • Page 123 DISASSEMBLY AND ASSEMBLY Figure 3-48. Removing Connectors ASSEMBLING POINT When you install the ribbon feed change lever unit, join the tip of the tractor select lever and the tractor select gear holder correctly. (Refer to Figure 2-12.) 3-33 Rev. B...

  • Page 124: Tractor Select Lever (Upper And Lower) Assembly Disassembly

    DFX-8500 3.2.6.3 Tractor Select Lever (Upper and Lower) Assembly Disassembly This section describes how to disassemble the tractor select lever assembly, including how to remove the ribbon feed motor and tractor select sensor. Step 1: Remove the ribbon feed change lever unit. (Refer to Section 3.2.6.2.) Step 2: Remove the two CP(S-P1)(M3x6) screws, leaf springs, and washers securing the ribbon feed motor to the ribbon feed motor frame and remove the motor.

  • Page 125: Ribbon Jam Sensor Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.4 Ribbon Jam Sensor Removal Step 1: Remove the right cover. (Refer to Section 3.2.3.2) Step 2: Disconnect the connector for the sensor from the connector junction board. Step 3: Remove the CP(S-P1) (M3x6) screw securing the sensor to the bracket, and remove the sensor. Figure 3-51.

  • Page 126: Connector Junction Board Assembly And Fpc Board Assembly Removal

    DFX-8500 3.2.6.5 Connector Junction Board Assembly and FPC Board Assembly Removal This section describes how to remove the connector junction board assembly and FPC board assembly. Step 1: Remove the left side cover. (Refer to Section 3.2.3.2) Step 2: Disconnect all the cables from the connector junction board assembly. Remove the two CP (S- P1) (M3x6) screws securing the connector junction board assembly to the printer mechanism and then remove the connector junction board assembly.

  • Page 127: Pg Sensor And Pg Motor Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.6 PG Sensor and PG Motor Removal CAUTION When you remove or install the PG sensor, be careful not to bend the PG motor encoder plate. Step 1: Remove the connector junction board assembly. (Refer to Section 3.2.6.5) Step 2: Remove the CBS screw (3X6) securing the PG sensor unit to the left frame.

  • Page 128: Plunger And Paper Bail Assembly Removal

    DFX-8500 3.2.6.7 Plunger and Paper Bail Assembly Removal This section describes how to remove the plunger (loading solenoid) and paper bail assembly. Step 1: Disconnect the black, 2-pin plunger connector from the connector junction board assembly, and remove the plunger cable from the connector junction board assembly. Step 2: Remove the two CP(S-P1) (M3x6) screws securing the plunger to the left side frame and remove the plunger.
  • Page 129 DISASSEMBLY AND ASSEMBLY Step 4: Remove the left tension roller lever spring. Step 5: Remove the E-ring (6) securing the paper bail shaft to the left frame and remove the platen roller shaft holder and paper bail lever. Figure 3-55. Paper Bail Assembly Removal 1/2 Step 6: Disconnect 2 fan harnesses and remove 2 screws (CPS-P1) securing the CR fan duct.

  • Page 130: Upper Paper Guide And Top Pe Sensor Removal

    DFX-8500 3.2.6.8 Upper Paper Guide and Top PE Sensor Removal Step 1: Remove the paper bail assembly. (Refer to Section 3.2.6.7) Step 2: Disconnect the red, 3-pin, top PE sensor connector from the connector junction board assembly. Figure 3-57. Top PE Sensor Connector Removal Step 3: Remove the two CBS (M4x6) screws securing the upper paper guide to both frames and remove the paper guide.

  • Page 131: Tension Roller Shaft Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.9 Tension Roller Shaft Removal This section describes how to remove the tension roller shaft. It is better to remove the tension roller shaft with the paper bail assembly removed; however, removing it is not required. (Refer to Section 3.2.6.7.) for instructions on how to remove the paper bail assembly.) Step 1: Remove the connector junction board assembly.
  • Page 132 DFX-8500 Step 7: Remove the CR motor fan. (Refer to Section 3.2.6.19.) Step 8: Remove the E-ring (6) at the right end of the tension roller shaft and remove the tension roller shaft holder along with the leaf spring and the washer. Step 9: Remove the tension roller shaft by taking it out from the right frame.

  • Page 133: Platen Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.10 Platen Removal Step 1: Remove the paper bail assembly. (Refer to Section 3.2.6.7.) Step 2: Remove the upper paper guide. (Refer to Section 3.2.6.8.) Step 3: Remove the four hexagon socket screws securing the platen to the platen holders. Then remove the platen with the lower paper guide composed of 3 parts in it.

  • Page 134: Paper Jam Sensor Removal

    DFX-8500 3.2.6.11 Paper Jam Sensor Removal Step 1: Remove the platen along with the lower paper guide composed of 3 parts. (Refer to Section 3.2.6.10.) Step 2: Remove the CPN(SP)(M4x8) screw securing the left part of the lower paper guide to the platen. Step 3: Remove the part from the platen.

  • Page 135: Pull Tractor Sensor Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.12 Pull Tractor Sensor Removal Step 1: Remove the upper paper guide. (Refer to Section 3.2.6.8) Step 2: Disconnect the red 2-pin pull tractor sensor connector from the connector junction board assembly. Step 3: Remove the CP(S) (M2x14) screw securing the pull tractor sensor (a micro-switch type sensor) to the left side frame and remove the sensor.

  • Page 136: Paper Width (Pw) Sensor Removal

    DFX-8500 3.2.6.13 Paper Width (PW) Sensor Removal Step 1: Disconnect the connector for the PW sensor. Step 2: Remove the CP(S-P1) (M2.5x6) screw securing the PW sensor to the ribbon mask holder. Figure 3-67. PW Sensor Removal 3-46 Rev. B...

  • Page 137: Pg Home Sensor Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.14 PG Home Sensor Removal Step 1: Remove the front/rear tractor select lever assembly. (Refer to Section 3.2.6.2.) Step 2: Remove the E-ring securing the carriage guide shaft gear to the rear carriage guide shaft. Figure 3-68. Carriage Guide Shaft Gear Removal Step 3: Disconnect the white, 2-pin, PG home sensor connector from the connector junction board assembly.
  • Page 138 DFX-8500 ASSEMBLING POINT When you install the CR guide shaft gear, align the rib in the CR guide shaft gear with the PG adjustment transmission gear as shown in the figure below, then rotate the CR guide shaft gear 10 mm in CCW. Figure 3-70.

  • Page 139: Pf Motor Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.15 PF Motor Removal Step 1: Remove the connector junction board assembly. (Refer to Section 3.2.6.5.) Step 2: Remove the three CP (SP-1) (M4x8) screws securing the PF motor to the left side frame. Step 3: Remove the PF motor from the inside of the left side frame. Figure 3-71.

  • Page 140: Left Side Frame Gear Removal

    DFX-8500 3.2.6.16 Left Side Frame Gear Removal Step 1: Remove the front/rear tractor select lever assembly. (Refer to Section 3.2.6.2.) Step 2: Remove the connector junction board assembly. (Refer to Section 3.2.6.5.) Step 3: Remove the PG motor. (Refer to Section 3.2.6.6.) Step 4: Remove the series of gears in the order indicated by the numbers in Figure 3-72.

  • Page 141: Front Tractor Assembly Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.17 Front Tractor Assembly Removal This section describes how to remove the front tractor assembly. Step 1: Disconnect the connector white 3-pin front PE sensor from the connector junction board. Step 2: Remove the connector junction board assembly. (Refer to Section 3.2.6.5.) Step 3: Lay the mechanism on its back.

  • Page 142: Rear Tractor Assembly Removal

    DFX-8500 3.2.6.18 Rear Tractor Assembly Removal This section describes how to remove the rear tractor assembly. Step 1: Disconnect the connector white 3-pin rear PE sensor from the connector junction board. Step 2: Remove the connector junction board assembly. (Refer to Section 3.2.6.5.) Step 3: Remove the flange nut securing the wire holder spring set to the right side frame, and remove the set.

  • Page 143: Cr Motor Fan Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.19 CR Motor Fan Removal Step 1: Disconnect the cable for the motor from the relay connector. Step 2: Remove 2 fan fixing screws and remove the fan. Figure 3-76. CR Motor Fan Removal 3-53 Rev. B...

  • Page 144: Cr Motor Removal

    DFX-8500 3.2.6.20 CR Motor Removal Step 1: Remove the right cover. (Refer to Section 3.2.3.2.) Step 2: Disconnect the red and black cables from the terminals on the CR motor. (two cables for each terminal) Step 3: Remove the three CP(S) (M4x10) screws securing the CR motor to the right side frame and remove the motor.

  • Page 145: Cr (Carriage Encoder) Sensor Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.21 CR (Carriage Encoder) Sensor Removal Step 1: Remove the printhead. (Refer to Section 3.2.2.) Step 2: Disconnect the red 4-pin CR sensor connector from the carriage connector junction board. Step 3: Remove the two CP(S-P1) (M2.6 x 5) screws securing the CR sensor to the carriage and remove the sensor.

  • Page 146: Carriage Mechanism Disassembly

    DFX-8500 3.2.6.22 Carriage Mechanism Disassembly This section describes how to disassemble the carriage mechanism, including removing the carriage, CR timing belt, and front and rear carriage guide shafts. Step 1: Remove the CR motor. (Refer to Section 3.2.6.20.) Step 2: Remove the belt pulley from the belt pulley holder. Figure 3-80.
  • Page 147 DISASSEMBLY AND ASSEMBLY Step 5: Remove the front carriage guide shaft by pulling it through the hole in the right side frame. (When you remove the front carriage guide shaft, move the carriage to the left side.) Step 6: On the left side frame, remove the E-ring (6) securing the carriage guide shaft gear to the rear carriage guide shaft, then remove the carriage guide shaft gear and paper thickness sensor holder.
  • Page 148 DFX-8500 ASSEMBLING POINT When you install the front carriage guide shaft, tighten the screws while pushing the shaft toward the platen. ADJUSTMENT REQUIRED When you assemble the carriage mechanism, perform the following adjustments: Carriage timing belt tension adjustment (described in Section 4.1.2) Carriage guide shaft parallelism adjustment (described in Section 4.1.5 and Section 4.1.6) Platen gap motor value (platen gap) adjustment (described in Section 4.1.7) Bidirectional printing adjustment (described in Section 4.1.8)

  • Page 149: Paper Support Assembly Removal

    DISASSEMBLY AND ASSEMBLY 3.2.6.23 Paper Support Assembly Removal Step 1: Disassemble the carriage mechanism and remove all the parts related to the carriage. (Refer to Section 3.2.6.22.) Step 2: Referring to the exploded diagram in the Appendix, remove the paper support assembly. ADJUSTMENT REQUIRED When you install the paper support assembly, perform the following adjustments: Carriage timing belt tension adjustment (described in Section 4.1.2)

  • Page 150: Pf Drive Roller Removal

    DFX-8500 3.2.6.24 3.2.6.21 PF Drive Roller Removal Step 1: Remove the platen. (Refer to 3.2.6.10) Step 2: Remove the CR motor. (Refer to Section 3.2.6.20) Step 3: Remove the left side frame gears. (Refer to Section 3.2.6.16) Step 4: Referring to the exploded diagram in the Appendix, remove the PF driver roller. ADJUSTMENT REQUIRED When you install the PF drive roller, perform the following adjustments: Carriage timing belt tension adjustment (described in Section 4.1.2)

  • Page 151: Adjustment

    CHAPTER 4 ADJUSTMENT 4.1 PRINTER MECHANISM ADJUSTMENTS ............4-1 4.1.1 PG Motor Backlash Adjustment................... 4-1 4.1.2 Carriage Timing Belt Tension Adjustment ................4-2 4.1.3 Tractor Wire Spring Tension Adjustment ................4-3 4.1.4 Pull Tractor Sensor Position Adjustment................4-4 4.1.5 Carriage Guide Shaft Parallelism Adjustment ..............4-5 4.1.6 Platen Angle Adjustment ......................

  • Page 153: Printer Mechanism Adjustments

    ADJUSTMENT 4.1 PRINTER MECHANISM ADJUSTMENTS This section describes the printer mechanism adjustments for the DFX-8500. Whenever the printer is disassembled and the printer parts mentioned in this section are replaced or repaired, perform the appropriate adjustments to ensure proper printer operation. Perform adjustments before assembling the printer.

  • Page 154: Carriage Timing Belt Tension Adjustment

    DFX-8500 4.1.2 Carriage Timing Belt Tension Adjustment The carriage timing belt tension must be adjusted when any carriage mechanism part (such as the CR motor, belt pulley, or carriage timing belt) is disassembled. Remove the printer mechanism before performing this adjustment.

  • Page 155: Tractor Wire Spring Tension Adjustment

    ADJUSTMENT 4.1.3 Tractor Wire Spring Tension Adjustment This section describes the tractor wire spring tension adjustment. If the spring is not adjusted properly, paper jams may occur, because the continuous paper tension (in the horizontal direction) is incorrect. When you remove the front or rear tractor assembly, perform this adjustment.

  • Page 156: Pull Tractor Sensor Position Adjustment

    DFX-8500 4.1.4 Pull Tractor Sensor Position Adjustment This section describes the pull tractor sensor position adjustment. If the sensor position is incorrect, the sensor is always on. When you replace or disassemble the platen, rear paper guide, platen roller shaft, tension roller shaft, or pull tractor sensor, perform this adjustment.

  • Page 157: Carriage Guide Shaft Parallelism Adjustment

    EPSON. Do not adjust the parallelism using any other method. ; Dial gauges (x 2) #F610 (Part No. B1019466) ; Dial gauge base #F611 (Part No.
  • Page 158 DFX-8500 Step 3: Attach the another needle to the master surface, APPROX. 2.00 mm depth, then correspond to the another gauge measure, and tighten the hexagonal screw. Figure 4-7. Dial Gauge set Up 2 Step 5: Set the black marker to the "0" position. Figure 4-8.
  • Page 159 ADJUSTMENT Step 6: Remove a CP(PS)(M3X6) screw securing the timing belt holder to the timing belt, then remove the timing belt holder. Figure 4-9. Carriage Plate Removal Step 7: Remove the paper bail assembly. (Refer to Section 3.2.6.5.) Step 8: Remove the tension roller shaft. (Refer to Section 3.2.6.7.) Step 9: Remove the printhead with the mask-less holder.
  • Page 160 DFX-8500 Step 12: Measure the distance between the platen and the carriage guide shaft on the left side. Then measure the distance between the platen and the rear carriage guide shaft on the right side, and compare these values.(Figure4-11 shows the measurement position and the parallelism adjust lever operation.) Note: When you shift the carriage manually, do not touch the both dial gauges.

  • Page 161: Platen Angle Adjustment

    Figure 4-7) is less than + 0.015 mm. Since this value is extremely small, you must use the two dial gauges, dial gauge base, and dial gauge master supplied by EPSON. Do not adjust the parallelism using any other method. ; Dial gauge #F610 (Part No. B1019466) ; Dial gauge base #F611 (Part No.
  • Page 162 DFX-8500 Step 4: Using the carriage guide shaft gear, attach the both dial gauge needles to the platen surface.(The needle doesn’t reach the end of the stroke). Figure 4-14. Attaching Two Needles to Platen Surface Step 5: Measure the angle difference about three position such as figure below.(Using the CR motor pulley to move the carriage with the dial gauge toward the right side.
  • Page 163 ADJUSTMENT Figure 4-16. Measuring Angle Difference 2 Step 6: If the angle difference of two values are more than + 0.015 mm, loosen (but do not remove) the two hexagonal screws securing the platen stay to both side frames, then change the platen angle slowlly and manually.) Step 7: Tighten two hexagonal screws securing the platen stay to both side frames.

  • Page 164: Platen Gap Motor Value Adjustment

     Thickness gauge (0.43 mm)  Thickness gauge (0.80 mm)  Tension gauge (200 g) : #F545 (EPSON Part No. B765114601) ; Do not turn the printer off during adjustment.  When adjusting the platen gap to narrower or wider using the Micro Feed (^) and Micro Feed (v) switches, be sure to adjust the gap by 1 step at a time.
  • Page 165 ADJUSTMENT Step 1: Remove the paper, ribbon cartridge, and ribbon mask holder from the printer. Then confirm the ALPHA value written on the print head nose. Step 2: Close the top cover. ALPHA Value Write Mode : Step 3: Turn the printer on while pressing the Tear Off, Micro Feed (v), and Front/Rear switches. At this time the printer performs PG home position seek.
  • Page 166 DFX-8500 Figure 4-19. Thickness Gauge Setting Method Table 4-1. BETA Values Adjustment Beta No. Reference Thickness Gauge Allowed Value Default Value*1) BETA 3' 0.43 mm with 150gf pull BETA 2 0.00 mm 367 - 419 BETA 3 0.43 mm 405 - 437 BETA 4 0.80 mm 418 - 475...

  • Page 167: Measurement Seeking And Bi-Directional Printing Adjustment

    ADJUSTMENT 4.1.8 Measurement Seeking and Bi-directional Printing Adjustment The purpose of this adjustment is to correct the printer mechanism parameters which control bi-directional printing. Be sure to perform this adjustment when required. If this adjustment is not performed correctly, bi- directional printing may be miss-aligned, or, in the worst case, the carriage might operate incorrectly.
  • Page 168 DFX-8500 Figure 4-20. Carriage Measurement Seeking 4-16 Rev. B...
  • Page 169 ADJUSTMENT Figure 4-21. Flight Time Adjustment 4-17 Rev. B...
  • Page 170 DFX-8500 Figure 4-22. Test Print Pattern Table 4-2. LED indication and Adjustment Value Comparison LED*1) On*2) Ribbon (Bi-d. adjustment) + (positive) (negative) (PG adjustment) Pause Top of Form Tear Off Copy Pitch „„† „†† ††† „† Font †† 7 Segment*3) 0 to 9 *1) „: off, †: On *2) Indicates 2...
  • Page 171 ADJUSTMENT Figure 4-23. Bi-d. Adjustment 4-19 Rev. B...

  • Page 173: Troubleshooting

    CHAPTER 5 TROUBLESHOOTING 5.1 PROBLEM ISOLATION..................5-1 5.2 SELF DIAGNOSTIC FUNCTION................5-2 5.3 TROUBLESHOOTING ...................5-3...

  • Page 175: Troubleshooting Information

    TROUBLESHOOTING 5.1 TROUBLESHOOTING INFORMATION The information in this chapter makes troubleshooting easier to perform by listing various problems that can occur and providing possible solutions. Note: For this printer, no special tools are necessary for troubleshooting to the unit level, with the exception of a digital multi-meter.
  • Page 176 DFX-8500 5.1.2 Bypassing Interlock Switch and Cover Open Sensor To print with the top cover open or removed, you need to bypass the interlock switch and cover open sensor because these sensors automatically disable printing when the top cover is open. Figure 5-1.
  • Page 177 TROUBLESHOOTING 5.1.3 Coil Resistance The following table provides the coil resistance for the motor, head fan, plunger, and printhead. Table 5-2. Motor, Fan, Plunger, and Printhead Coil Resistance Part Coil Resistance CR motor 1.66 ohms + 10 % PF motor 2.80 ohms + 10 % at 25 RF motor 150 ohms + 10 % at 25...
  • Page 178 DFX-8500 Figure 5-4. Printhead Coil Resistance Rev. B...
  • Page 179 TROUBLESHOOTING 1. The printer does not operate when power is turned on. Rev. B...
  • Page 180 DFX-8500 2. Carriage operation is abnormal. Rev. B...
  • Page 181 TROUBLESHOOTING 3. Carriage operation is normal, but the self-test is printed incorrectly (1/3). Rev. B...
  • Page 182 DFX-8500 3. Carriage operation is normal, but the self-test is printed incorrectly (2/3). Rev. B...
  • Page 183 TROUBLESHOOTING 3. Carriage operation is normal, but the self-test is printed incorrectly (3/3). Rev. B...
  • Page 184 DFX-8500 4. Printing is normal, but paper feeding is abnormal. 5-10 Rev. B...
  • Page 185 TROUBLESHOOTING 5. Panel unit operation is abnormal. 5-11 Rev. B...
  • Page 186 DFX-8500 6. Data sent by the host computer is printed incorrectly. Note : The flowchart below assumes the host computer is operating normally. 5-12 Rev. B...
  • Page 187 TROUBLESHOOTING 5.2 CIRCUIT BOARD REPAIR This section provides detailed troubleshooting methods to isolate components in the power supply or on the main board. This information is for use by service personnel who repair to the component level. The table below provides causes, checkpoints, and solutions for different power supply circuit problems. The checkpoints include waveforms for normal operation.
  • Page 188 DFX-8500 Table 5-5. C204 PSB/PSE Board Component Repair 2/3 Symptom Cause Checkpoint Solution The +37 VDC (VP1 / The main switching FETs Observe the voltage Replace QF101. VP2) line is dead. QF101 is defective. waveform between the drain side and GND. IC101 is defective.
  • Page 189 TROUBLESHOOTING Table 5-5. C204 PSB/PSE Board Component Repair 3/3 Symptom Cause Checkpoint Solution The 5 VDC line is IC204 is defective. Check the voltage level at pin 10 (V1) Replace IC204. defective. and pin5 (GP). Observe the drive waveform at pin 8 Replace IC204 or (VO) and pin 5 (GP).
  • Page 190 DFX-8500 5.2.2 C204 MAIN/DRV/DRV-B Boards Repair Table 5-6 indicates major components which is used for the C204 MAIN/DRV/DRV-B boards and Table 5-7 shows the C204 MAIN/DRV/DRV-B boards component level troubleshooting. Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 1/7 Symptom Cause Checkpoint Solution The printer does...
  • Page 191 TROUBLESHOOTING Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 2/7 Symptom Cause Checkpoint Solution The printer does The control ROM is Confirm that the PROM is inserted the Replace IC5. not operate at all. defective. socket correctly. The gate array (IC1) Check pin 86 (D0)of IC1 for a change Replace IC1.
  • Page 192 DFX-8500 Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 3/7 Symptom Cause Checkpoint Solution The carriage IC1 on the C204 Check the signals for the carriage Replace IC1. operates MAIN board is motor phases at pins 204 (CRA), 205 abnormally. defective. (CRB), 206 (CRC), and 5 (CRD) of IC1 Q16, Q17, Q18, or Check the signals for the carriage...
  • Page 193 TROUBLESHOOTING Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 4/7 Symptom Cause Checkpoint Solution The carriage The carriage encoder Observe the carriage encoder sensor Replace the operates sensor is defective. output signal at pins 4 (ENCA) and 3 carriage encoder abnormally. (ENCB) of CN4 on the C204 MAIN sensor.
  • Page 194 DFX-8500 Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 5/7 Symptom Cause Checkpoint Solution Paper feeding is The CPU IC2) on the Check the PF motor phase drive Replace IC2. abnormal. C204 MAIN board is signals at pins 2 - 5 of IC2. defective.
  • Page 195 TROUBLESHOOTING Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 6/7 Symptom Cause Checkpoint Solution The head fan IC1 on the C204 Observe the PG motor phase signal at Replace IC1. operation is MAIN board is pins 163 (FANA) and 164 (FANAX) of abnormal.
  • Page 196 DFX-8500 Table 5-6. C204 MAIN/DRV/DRV-B boards Component Repair 7/7 Symptom Cause Checkpoint Solution The self-test is IC1 on the C204 Observe the output signal at pins 136- Replace IC1. printed incorrectly MAIN board is 181 of IC1. defective. The head driver FETs Observe the voltage waveform at the Replace the on the C204 MAIN...
  • Page 197 TROUBLESHOOTING 5.2.3 Printer Mechanism Repair The table below describes how to isolate problems with the printer mechanism. To replace or adjust printer mechanism parts, refer to Chapter 3, Disassembly and Assembly , and Chapter 4, Adjustments . If a symptom recurs following a repair attempt, look for other possible causes and solutions in the table below. Table 5-7.
  • Page 198 DFX-8500 Table 5-7. Printer Mechanism Repair 2/4 Symptom Cause Checkpoint Solution A particular dot The printhead is Measure the printhead coil resistance. Replace the does not print. defective. (Refer to Figure 5-4 for details.) printhead. Check whether a dot wire is worn. Replace the printhead.
  • Page 199 TROUBLESHOOTING Table 5-7. Printer Mechanism Repair 3/4 Symptom Cause Checkpoint Solution The RF motor The parallelism value Check whether the carriage moves Perform the does not operate. is incorrect. smoothly when moved manually. parallelism (Check that foreign objects are not adjustment, as lodged in the printer mechanism.) described in Section...
  • Page 200 DFX-8500 Table 5-7. Printer Mechanism Repair 4/4 Symptom Cause Checkpoint Solution Printing occurs The PW sensor is Check the PW sensor. Replace the PW outside the paper defective. sensor. width. The paper bail The plunger is Check the coil resistance of the Replace the plunger.
  • Page 201 CHAPTER 6 MAINTENENCE 6.1 PREVENTIVE MAINTENENCE................6-1 6.2 LUBRICATION AND ADHESIVE APPLICATION...........6-1...

  • Page 203: Maintenance

    6.2 LUBRICATION AND ADHESIVE APPLICATION EPSON recommends that the printer be lubricated at the points illustrated in Figures 6-2, 6-3, and 6-4 using EPSON lubricants O2 and G26. These lubricants have been extensively tested and found to comply with needs of the printer.
  • Page 204 DFX-8500 Table 6-2. Lubrication Points Ref. No. Ref. Figure Lubrication Point Lubricant Carriage oil pad ring (on both left and right sides of carriage) Carriage oil pad (under the carriage head cable holder), Hole holding the tip of the rear carriage guide shaft (in both left and right side frames Both edges of the rear carriage guide shaft Parallelism adjustment lever (contact point with the rear carriage...
  • Page 205 MAINTENANCE Figure 6-2. Lubrication and Adhesive Diagram 1 Rev. B...
  • Page 206 DFX-8500 Figure 6-3. Lubrication and Adhesive Diagram 2 Rev. B...
  • Page 207 MAINTENANCE Figure 6-4. Lubrication and Adhesive Diagram 3 Rev. B...
  • Page 209 APPENDIX A.1 CONNECTOR PIN ASSIGNMENTS ..............A-1 A.2 CIRCUIT DIAGRAMS ................... A-9 A.3 COMPONENT LAYOUT..................A-21 A.4 CONNECTOR JUNCTION BOARD CONNECTORS.......... A-27 A.5 PART LIST ......................A-28 A.6 EXPLODED DIAGRAMS ..................A-31...

  • Page 211: Connector Pin Assignments

    APPENDIX A.1 CONNECTOR PIN ASSIGNMENTS Figure A-1 illustrates the interconnection of the primary components. Table A-1 summarize the description and sizes of the connectors. Figure A-1. Cable Connection Rev. B...
  • Page 212 DFX-8500 Table A-1. Board Connector Summary Connector Connection Pin Number Table to Refer C204 MAIN Board 30 pins Table A-2 Mechanism (Print head) 20 pins Table A-3 C204 DRV-B board 2 pins Table A-4 Cover Open 4 pins Table A-5 Mechanism (Carriage encoder) 14 pins Table A-6...
  • Page 213 APPENDIX Table A-2. C204 MAIN Board Connector CN1 Signal Name Function P+10 Printhead pin #10 P-10 P+12 Printhead pin #12 P-12 P+16 Printhead pin #16 P-16 P-17 P+17 Printhead pin #17 P-11 P+11 Printhead pin #11 Printhead pin #9 Printhead pin #2 Printhead pin #1 HFANB HF motor phase B...
  • Page 214 DFX-8500 Table A-5. C204 MAIN Board Connector CN4 Signal Name Function ENCB CR encoder B phase pulse ENCA CR encoder A phase pulse Table A-6. C204 MAIN Board Connector CN5 Signal Name Function LED_DATA LED data LED_XLE LED data latch LED_CLK LED data clock LED_XOE...
  • Page 215 APPENDIX Table A-12. C204 MAIN Board Connector CN11 Signal Name Function 1, 2, 3, 4, 5, 6 BTXD Transmit data XREADY Ready BRXD Receive data BXRST Reset signal Inhibit signal output XCMDREQ Command request signal XWRRDY Write ready signal XRDREQ Read request signal Write signal Read signal...
  • Page 216 DFX-8500 Table A-13. C204 MAIN Board Connector CN14 Signal Name Function +37 VDC 2, 3, 4 5, 6, 7, 8 9, 10 +5 VDC switched by reset status HF control signal Plunger N channel RFH/R RF motor common RF motor C phase pulse RF motor A phase pulse PG motor D phase pulse PG motor B phase pulse...
  • Page 217 APPENDIX Table A-15. C204 MAIN Board Connector CN16 Signal Name Function DIPCNT2 DIP SW select port 2 DIPCNT3 DIP SW select port 3 DIPCNT4 DIP SW select port 4 DIPCNT5 DIP SW select port 5 DIPCNT6 DIP SW select port 6 DIPCNT7 DIP SW select port 7 DIPCNT8...
  • Page 218 DFX-8500 Table A-17. C204 DRV Board Connector CN3 Signal Name4 Function 1, 2, 3 +37 VDC 4, 5, 6 GND for VP3 Table A-18. C204 DRV-B Board Connector CN1 Signal Name4 Function Printhead pin #6 Printhead pin #4 P-18 P+14 Printhead pin #14 P-14 P+18...

  • Page 219: Circuit Diagrams

    APPENDIX A.2 CIRCUIT DIAGRAMS See the following pages for the figures below: Figure A-2. C204 MAIN Board Exploded Diagram C204 MAIN Figure A-3. C204 DRV Board Exploded Diagram C204 DRV Figure A-4. C204 DRV-B Board Exploded Diagram C204 DRV-B Figure A-5. C204 PSB Board Exploded Diagram C204 PSB Figure A-6.

  • Page 225: Component Layout

    APPENDIX A.3 Component Layout Figure A- 7. C204 MAIN Board Component Layout (1) A-21 Rev. B...
  • Page 226 DFX-8500 Figure A- 8. C204 MAIN Board Component Layout (2) A-22 Rev. B...
  • Page 227 APPENDIX Figure A- 9. C204 DRV Board Component Layout (1) Figure A- 10. C204 DRV Board Component Layout (2) A-23 Rev. B...
  • Page 228 DFX-8500 Figure A- 11. C204 DRV-B Board Component Layout (1) Figure A- 12. C204 DRV-B Board Component Layout (2) A-24 Rev. B...
  • Page 229 APPENDIX Figure A- 13. C204 PSB Board Component Layout A-25 Rev. B...
  • Page 230 DFX-8500 Figure A- 14. C204 PSE Board Component Layout A-26 Rev. B...

  • Page 231: Connector Junction Board Connectors

    APPENDIX A.4 Connectors on the Connector Junction Board See the figure bellow for the connector arrangement on the connector junction board. Figure A- 15. Connectors on the Connector Junction Board A-27 Rev. B...

  • Page 232: Part List

    DFX-8500 A.5 Part List Table A-20. Part List (1/3) Part Names Part Names HOUSING ASSY.,LOWER SPACER,PS UNIT FRAME ASSY.,BOTTOM LEAF SPRING,BASE FRAME COVER ASSY.,FRONT COVER, DIP SWITCH HOUSING ASSY.,UPPER COVER,CONNECTOR,UPPER ECW HOUSING ASSY.,TOP C.B.(O)SCREW M3X8 F/ZN LOGO PLATE CONNECTOR LOCK NUT for USA COVER,PAPER SUPPORT CONNECTOR LOCK NUT for others CAP,LOWER...
  • Page 233 APPENDIX Table A-20. Part List (2/3) Part Names Part Names BOARD ASSY.,INTERMIT,HEAD PLATEN ROLLER TRANSMISSION GEAR BOARD ASSY.,INTERMIT,CARRIAGE PLATEN ROLLER MIDDLE GEAR BOARD ASSY.,DETECTOR,PTS TENSION ROLLER GEAR PAPER ASSY.,SUPPORT PAPER BAIL GEAR ROLLER ASSY.,LOAD PAPER BAIL LEVER BLUSH,ELIMINATION ELECTLIC CUP SCREW M3X30 DETECTOR ASSY.,PE,UPPER TIMING BELT,PF DETECTOR ASSY.,PW...
  • Page 234 DFX-8500 Table A-20. Part List (3/3) Part Names Part Names SPUR,GEAR,40 FAN,CR EXTENSION SPRING,320 RIBON MASK SUB ASSY. MOUNT PLATE WIRE,RIGHT SPUR,GEAR,24 MOUNT PLATE,WIRE,LEFT MOUNT PLATE,DETECTOR,RJ EXTENSION SPRING,40 DETECTOR ASSY.,RJ0V,0A, SPUR GEAR,32 HARNESS,FAN C.P.S SCREW,2X14,F/ZN PAPER GUIDE ASSY.,PJ DETECTOR HEXAGON NUT A INDIVIDUAL CARTON FOR AMERICA HEXAGON NUT,B INDIVIDUAL...
  • Page 235 APPENDIX A.6 EXPLODED DIAGRAMS See the following pages for the exploded diagrams below. Note that the last page shows the packing material for DFX-8500. Figure A-16. EXPLODED DIAGRAMS FOR DFX-8500 (1) EXPLODED DIAGRAM (1) Figure A-17. EXPLODED DIAGRAMS FOR DFX-8500 (2) EXPLODED DIAGRAM (2) Figure A-18.
  • Page 244 EPSON OVERSEAS MARKETING LOCATIONS EPSON AMERICA, Inc. EPSON DEUTCHLAND GmBH 20770 Madrona Avenue, Zülpicher Straße 6, 4549 Düsseldorf P.O. Box 2842 Germany Torrance, CA 90509-2842 Phone: (800)922-8911 Phone: (0211)56030 Fax: (310)782-5220 Telex: 8584786 EPSON UK LTD. EPSON FRANCE S.A. Campus 100, Maylands Avenue,...
  • Page 245 EPSON SEIKO EPSON CORPORATION...

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